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Definitions

HD Video

High-definition video (HD Video) refers to videos of higher quality and resolution than standard-definition video. This involves display resolutions of 1,280 x 720 pixels x 30fps for 720p HD Video. Video support may vary based on host device, file attributes and other factors.

Full HD Video

Full high-definition video (Full HD video) refers to videos of an even higher quality and resolution than HD video. This involves a display resolution of 1,920 x 1,080 pixels x 30fps for 1080p Full HD Video. Video support may vary based on host device, file attributes and other factors.

4K/4K Ultra HD Video

4K resolution is a generic term for display devices or content having horizontal resolution on the order of 4,000 pixels. Several 4K resolutions exist in the fields of digital television and digital cinematography. In the movie projection industry, Digital Cinema Initiatives (DCI) is the dominant 4K standard. Video support may vary based on host device, file attributes and other factors.

Ultra High Definition (UHD) is an umbrella term that encompasses higher resolutions (more pixels) than HDTV, as well as more realistic color and higher frame rates.

When used in a home context, 4K/UHD means the TV's screen has a minimum resolution of 3,840 pixels wide and 2,160 pixels high, making it the equivalent of two 1080p screens in height and two in length. This resolution was originally known as Quad HD.

Another resolution, known as 4K x 2K (4,096 x 2,160 pixels), is used by some projectors and many professional cameras. It also falls under the umbrella of 4K/UHD.

With the arrival of 4K, there are four main resolution standards for use in the home: standard definition (480p/540p), high definition (720p), full high definition (1080p) and ultra-high definition (2160p).

Video Speed Class

There are two kinds of video speed classifications: Speed Class and UHS Speed Class. These indicate the minimum sustained write speed necessary for video recording, so that minimum and constant speed is guaranteed for camcorders and cameras. Speed Class is designated as Class 2, 4, 6 and 10, and UHS Speed Class is designated UHS Speed Class 1 or UHS Speed Class 3.

UHS-I

UHS stands for Ultra High Speed. SDHC and SDXC products that are UHS-I enabled offer bus-interface speeds, capable of supporting theoretical data transfer speeds of up to 104MB/s, four times faster than the previous possible transfer speed of 25MB/s. (UHS enabled host device required to realize the higher performance.) Cards supporting UHS-I are fully backwards-compatible in non-UHS hosts, although performance in non-UHS hosts will be limited by the host's bus-interface capability.

UHS-II

UHS-ll is the latest and fastest SD card interface available to communicate to camera/camcorder hosts and to computers with maximum bus interface speeds up to 312MB/s. Cards supporting UHS-ll are fully backwards-compatible in UHS-l hosts, although performance in UHS-l hosts will be limited by the host's bus-interface capability.

Normal and high-speed cards can also be used with UHS-I host devices. Higher performance enabled by a UHS-II host device can only be achieved with a UHS-II memory card.

Compatibility

Not all devices support SDXC/microSDXC memory card formats. Not all devices support UHS-I or UHS-II speed bus. Check with your device manufacturer for more details.